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#include <iostream>
#include <string>
#include <toml.hpp>
#include <nlohmann/json.hpp>
#include <cmath>
toml::value convert_to_toml(const nlohmann::json& j)
{
if(j.is_array())
{
toml::value a(toml::array{});
for(const auto& v : j)
{
a.push_back(convert_to_toml(v));
}
return a;
}
else if(j.size() == 2 &&
j.contains("type") && j.at("type").is_string() &&
j.contains("value") && j.at("value").is_string() )
{
const auto type = j.at("type" ).get<std::string>();
const auto value = j.at("value").get<std::string>();
if(type == "string")
{
return toml::value(value);
}
else if(type == "int")
{
toml::detail::context<toml::type_config> ctx(toml::spec::default_version());
auto loc = toml::detail::make_temporary_location(value);
return toml::detail::parse_integer(loc, ctx).unwrap();
}
else if(type == "float")
{
toml::detail::context<toml::type_config> ctx(toml::spec::default_version());
auto loc = toml::detail::make_temporary_location(value);
if(auto f_r = toml::detail::parse_floating(loc, ctx))
{
return f_r.unwrap();
}
else // not conform TOML floating-point syntax.
{
// toml-test converts "inf" into "Inf"
if(value == "Inf" || value == "+Inf")
{
return toml::value(std::numeric_limits<double>::infinity());
}
else if(value == "-Inf")
{
return toml::value(-std::numeric_limits<double>::infinity());
}
else // sometimes toml-test uses large int with type:float
{
toml::floating_format_info fmt;
fmt.prec = value.size();
return toml::value(toml::detail::from_string<double>(value).unwrap(), fmt);
}
}
}
else
{
return toml::detail::literal_internal_impl(
toml::detail::make_temporary_location(value));
}
}
else // table.
{
toml::value t(toml::table{});
for(const auto& kv : j.items())
{
t[kv.key()] = convert_to_toml(kv.value());
}
return t;
}
}
int main(int argc, char** argv)
{
try
{
if(argc == 2)
{
const std::string fname(argv[1]);
std::ifstream ifs(fname);
const auto j = nlohmann::json::parse(ifs);
const auto t = convert_to_toml(j);
std::cout << toml::format(t) << std::endl;
return 0;
}
else
{
std::vector<char> buf;
std::cin.peek();
while(!std::cin.eof())
{
buf.push_back(static_cast<char>(std::cin.get()));
std::cin.peek();
}
std::string str(buf.begin(), buf.end());
const auto j = nlohmann::json::parse(str);
const auto t = convert_to_toml(j);
std::cout << toml::format(t) << std::endl;
return 0;
}
}
catch(const std::exception& err)
{
std::cout << "what(): " << err.what() << std::endl;
return 1;
}
}
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